2. Diagnose, adjust, and repair electrical/brake/cooling systems, hydraulic systems, starters/alternators, air conditioning systems, fan clutches, engine electronics, power steering systems, engines (gas and diesel), transmissions (manual and automatic), clutches, and/or differentials. Diagnose, adjust, and repair electrical/brake/cooling systems, hydraulic systems, starters/alternators, air conditioning systems, fan clutches, engine electronics, power steering systems, engines (gas and diesel), transmissions (manual and automatic), clutches, and/or differentials.